As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) BOMBARDIER HAS BEEN MADE AWARE THROUGH A COORDINATION MEMO FROM ROCKWELL COLLINS THAT AIRCRAFTS CONFIGURED WITH GPS-4000S UNITS MAY ENCOUNTER A CONDITION WHEN FLYING THROUGH SPECIFIC GEOGRAPHICAL AREAS (ABOVE 71Ï¿½ NORTH/SOUTH LATITUDE) THAT WILL RESULT IN A SIMULTANEOUS DUAL GPS RECEIVER LOSS OF SATELLITE SIGNAL PROCESSING.